scholarly journals Seismic Performance of Dam Piers Retrofitted with Reinforced Polymer Cement Mortar

2021 ◽  
Vol 11 (16) ◽  
pp. 7255
Author(s):  
Yoshimi Sonoda ◽  
Hiroki Tamai ◽  
Hirotsugu Ikeda
Keyword(s):  
Cement Mortar ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Seismic Retrofitting ◽  
Response Analysis ◽  
Reinforcement Effect ◽  
Design Standards ◽  
Rc Structures ◽  
Seismic Waveforms ◽  
Three Dimensional Finite Element

The deterioration of existing reinforced concrete (RC) structures is regarded as a problem worldwide. In Japan especially, the deterioration of RC dam structures has become severe. Many such dams meet design standards that were in place at the time of construction but do not meet the current seismic design standards, and appropriate seismic retrofitting is required. If the dam pier, which is an important part of the dam related to water storage, is damaged by an earthquake, the gate cannot be opened or closed, and the amount of water stored cannot be controlled. Therefore, the seismic retrofitting of dam piers is a top priority. However, various construction restrictions exist for dam piers, such as only the cross-section on the downstream side can be reinforced, and not on the upstream side where water is stored. Thus, it is difficult to apply the same reinforcement method that is applied to the piers of general road bridges. Therefore, in this study, we confirm the effectiveness of the SRS method (seismic retrofitting using cement mortar for shotcrete), which is suitable for partial reinforcement. Specifically, the dam piers of four types of existing dams were modeled using the three-dimensional finite element method, and a seismic response analysis was performed by inputting two types of seismic waveforms having different characteristics. As a result, the reinforcement effect of this method was verified according to structural characteristics. Furthermore, the effect of the reinforcement range on the reinforcement effect was clarified.

Dynamic Response Analysis of Suspenders of Arch Bridges Sudden Failure on Failure-Safety Theory

2013 ◽  
Vol 444-445 ◽  
pp. 1295-1300 ◽  
Author(s):  
Hua Li ◽  
Rui Li ◽  
Yue Chen ◽  
De Xiang Zhu
Keyword(s):  
Dynamic Response ◽  
Yunnan Province ◽  
Three Dimensional ◽  
Response Analysis ◽  
Force Transmission ◽  
Arch Bridge ◽  
Sudden Failure ◽  
Dimensional Finite Element ◽  
Arch Bridges ◽  
Three Dimensional Finite Element

Suspenders are main force-transmission components of half-through and through arch bridge, It is crucial for safety of bridges to its reliability and durability. Safety of the arch bridge will change when a suspender sudden failure, and affect the safety of the structure. Selecting a through arch bridge in Yunnan Province as the research object, it based on the three-dimensional finite element, this paper studied the dynamic response of arch bridge suspenders sudden failure on the failure-safety theory.

Simplified parametric modeling to predict vibration attenuation provided by on-grade slabs

2021 ◽  
Vol 263 (4) ◽  
pp. 2032-2043
Author(s):  
Steven Lank ◽  
Hal Amick
Keyword(s):  
Structural Breaks ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Parametric Modeling ◽  
Mitigation Measures ◽  
Soil Conditions ◽  
Real World Data ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

When measured vibration amplitudes at the proposed site for a highly sensitive facility exceed the maximum allowable for the sensitive equipment, mitigation measures must be integrated into the design that will reduce the vibration amplitudes to meet the requirements. Past studies have shown that thick concrete slabs supported on a well-engineered subgrade can effectively reduce ground borne vibrations at certain frequencies. Predicting the vibration performance of a new slab-on-grade can be a significant challenge, however, as the performance is highly dependent upon the site soil conditions and nature of the vibration sources impacting the location, as well as structural characteristics. Large and detailed three-dimensional finite element analysis models of the site conditions and proposed structure are often used for this type of assessment, however development of such a model requires significant time and cost to develop accurately. This presentation discusses a proposed an alternative simplified parametric modeling technique using two-dimensional plane strain modeling. This technique can be utilized in combination with real-world data to predict the relative benefit of various slab thicknesses and design features such as structural breaks. The paper will include multiple comparisons between predicted results using this methodology and field measurement results.

Analysis on Aseismic Performance of the Beijing Yintai Center

2010 ◽  
Vol 163-167 ◽  
pp. 3872-3877
Author(s):  
Zhi Qiang Zhang ◽  
Ai Qun Li ◽  
Yong Sun ◽  
Meng Ya Huang
Keyword(s):  
Seismic Behavior ◽  
Dynamic Properties ◽  
Three Dimensional ◽  
Response Analysis ◽  
Analysis Method ◽  
Element Analysis ◽  
Plastic Analysis ◽  
Earthquake Action ◽  
Rare Earthquake ◽  
Three Dimensional Finite Element

In this study, the seismic behavior of the main tower building of Beijing Yintai Center is presented with regard to the dynamic characteristics analysis and seismic response analysis. Firstly, by means of three-dimensional finite element analysis software, the dynamic properties and seismic responses under frequent earthquake action of the structure are obtained, respectively. It can be seen that the structure has a rational arrangement for structural elements and has a good seismic behavior. Then, the seismic behavior of the structure is studied through the dynamic elasto-plastic analysis method and static elasto-plastic analysis method under rare earthquake. Analysis results of both analysis methods show that the behavior of the structure accords with the earthquake performance objectives and the structure would not collapse under the rare earthquake action.

Structure Analysis of FTIR Infrared Spectrometer Based on ANSYS/Workbench

2012 ◽  
Vol 246-247 ◽  
pp. 189-193
Author(s):  
Zhao Ming Chen ◽  
Guo Tian He ◽  
Ji Ming He ◽  
Ze Yu Xu ◽  
Yuan Chang Lin ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Modal Shape ◽  
Harmonic Response ◽  
Infrared Spectrometer ◽  
Harmonic Response Analysis ◽  
Three Dimensional Finite Element ◽  
Ansys Workbench

The CAD software SolidWorks was used to create a three-dimensional finite element model of FTIR infrared spectrometer, and the model was imported into ANSYS/Workbench to modal analysis and harmonic response analysis. Through modal analysis, each order natural frequency and vibration shape were obtained. From modal shape analysis, all components of the stiffness strength and elastic deformation situation were got, and many times tests were carried to enhance stability of the structure and materials which had the most seriously deformation and direct effect impact to the quality of interferometer. The most sensitive frequency range of the system was concluded by harmonic response analysis, which provided a basis for further designing and improving of the spectrometer performance.

Seismic Response Analysis of Multi-Span Cable-Stayed Bridge

2008 ◽  
Vol 400-402 ◽  
pp. 737-742 ◽  
Author(s):  
Guo Jing He ◽  
Zhong Quan Zou ◽  
Yi Qing Ni ◽  
Jin Ming Ko
Keyword(s):  
Seismic Response ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Local Modes ◽  
Cable Stayed Bridge ◽  
Characteristics Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Dynamic Characteristics Analysis

Based on the dynamic characteristics analysis results of a precise three-dimensional finite element model, the earthquake responses of the bridge are analyzed in this paper. The influences of cable local modes and stabilizing cables on the seismic response are investigated by using different mode combinations and different models. It is found that the influence of cable local modes is negligible on the side towers while significant and not negligible on the main tower; the influence of the stabilizing cables is significant and not negligible on side towers, while minor and negligible on the main tower. As for the deck displacements, the influence of cable local modes is minor and negligible, while that of longitudinal stabilizing cables is significant and not negligible.

Seismic Response Analysis on Two-Tower Isolated Structure with Enlarged Base

2012 ◽  
Vol 193-194 ◽  
pp. 753-756
Author(s):  
Ying Bo Pang
Keyword(s):  
Base Isolation ◽  
Three Dimensional ◽  
Time History ◽  
Response Analysis ◽  
Analysis Model ◽  
Seismic Shear ◽  
Tower Structure ◽  
Story Drift ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, the three-dimensional finite element method has been adopted to respectively establish the base isolation of the two-tower structure with enlarged base and the story-isolated vibration analysis model. Each model has been conducted the elastic-plastic time-history analysis under the horizontal earthquakes. The results show that the dynamic characteristics of the structure have been significantly changed through the arrangement of isolation layer; the seismic responses, such as the story drift, the seismic shear and the acceleration of the structure, have been also greatly affected and the damping effect of the structure is obvious.

Sign in / Sign up

Export Citation Format

Share Document